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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Jun. 30, 2015
Payables and Accruals [Abstract]    
Employee compensation and benefits $ 39.7 $ 33.8
Accrued taxes payable 2.3 3.8
Other 8.8 8.5
Total Accrued liabilities $ 50.8 $ 46.1